<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .fox5{
            width: 0px;
            height: 0px;
            margin-top: 20px;
            border: 50px solid black;
            border-color: #000 #aaa #333;
        }
        .fox6{
            width: 0px;
            height: 0px;
            margin-top: 20px;
            border: 50px solid black;
            border-color: #000 #aaa #333;
        }
        .fox7{
            width:0;
            height:0;
            border-width:30px 30px 30px 0;
            border-style:solid;
            border-color:transparent #333 transparent transparent;
            margin:40px auto;
            position:relative;

        }
    </style>
</head>
<body>
    <article>
        <div class=".fox5"></div>
        <div class=".fox6"></div>
        <div class=".fox7"></div>
    </article>
</body>
</html>